package com.nageoffer.shortlink.admin.service.Impl;

import cn.hutool.core.bean.BeanUtil;
import com.alibaba.fastjson2.JSON;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.nageoffer.shortlink.admin.common.convention.exception.ClientException;
import com.nageoffer.shortlink.admin.common.enums.UserErrorCodeEnum;
import com.nageoffer.shortlink.admin.dao.entity.UserDO;
import com.nageoffer.shortlink.admin.dao.mapper.UserMapper;
import com.nageoffer.shortlink.admin.dto.req.UserLoginReqDTO;
import com.nageoffer.shortlink.admin.dto.req.UserRegisterReqDTO;
import com.nageoffer.shortlink.admin.dto.req.UserUpdateReqDTO;
import com.nageoffer.shortlink.admin.dto.resp.UserLoginRespDTO;
import com.nageoffer.shortlink.admin.dto.resp.UserRespDTO;
import com.nageoffer.shortlink.admin.service.UserService;
import lombok.RequiredArgsConstructor;
import org.redisson.api.RBloomFilter;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.BeanUtils;
import org.springframework.dao.DuplicateKeyException;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

import static com.nageoffer.shortlink.admin.common.constant.RedisCacheConstant.LOCK_USER_REGISTER_KEY;
import static com.nageoffer.shortlink.admin.common.enums.UserErrorCodeEnum.USER_EXIST;


/*
* 用户实现层
* */
@Service
@RequiredArgsConstructor
public class UserServiceImpl extends ServiceImpl<UserMapper, UserDO>implements UserService {
    private final RBloomFilter<String> userRegisterCachePenetrationBloomFilter;
    private final StringRedisTemplate stringRedisTemplate;
    private final RedissonClient redissonClient;
    private final UserMapper userMapper;

    @Override
    public UserRespDTO getUserByUsername(String username) {

        UserDO userDO = lambdaQuery()
                .eq(UserDO::getUsername, username)
                .one(); // 直接使用父类提供的lambdaQuery()简化代码

        UserRespDTO userRespDTO=new UserRespDTO();
        if(userDO!=null){
            BeanUtils.copyProperties(userDO,userRespDTO);
        }
        else throw new ClientException(UserErrorCodeEnum.USER_NULL);

        return userRespDTO;
    }

    @Override
    public Boolean hasUserName(String username) {
        return userRegisterCachePenetrationBloomFilter.contains(username);
    }

    @Override
    public void Register(UserRegisterReqDTO userRegisterReqDTO) {
         if(hasUserName(userRegisterReqDTO.getUsername())){
             throw new ClientException(UserErrorCodeEnum.USER_NAME_EXIST);
         }
        RLock lock = redissonClient.getLock(LOCK_USER_REGISTER_KEY + userRegisterReqDTO.getUsername());
        try {
            if(lock.tryLock()){
                try {
                    int inserted = userMapper.insert(BeanUtil.toBean(userRegisterReqDTO, UserDO.class));
                    if(inserted!=1){
                        throw new ClientException(UserErrorCodeEnum.USER_SAVE_ERROE);
                    }
                }catch (DuplicateKeyException e){
                    throw new ClientException(USER_EXIST);
                }
                userRegisterCachePenetrationBloomFilter.add(userRegisterReqDTO.getUsername());
                return;
            }
            throw new ClientException(UserErrorCodeEnum.USER_SAVE_ERROE);
        }finally {
            lock.unlock();
        }


    }

    @Override
    public void update(UserUpdateReqDTO userUpdateReqDTO) {
        LambdaUpdateWrapper<UserDO> updateWrapper = Wrappers.lambdaUpdate(UserDO.class)
                .eq(UserDO::getUsername, userUpdateReqDTO.getUsername());
        baseMapper.update(BeanUtil.toBean(userUpdateReqDTO, UserDO.class), updateWrapper);
    }

    @Override
    public UserLoginRespDTO login(UserLoginReqDTO userLoginReqDTO) {

        LambdaQueryWrapper<UserDO> queryWrapper = Wrappers.lambdaQuery(UserDO.class)
                .eq(UserDO::getUsername, userLoginReqDTO.getUsername())
                .eq(UserDO::getPassword, userLoginReqDTO.getPassword())
                .eq(UserDO::getDelFlag, 0);
        UserDO userDO = baseMapper.selectOne(queryWrapper);
        if(userDO==null){
            throw new ClientException(UserErrorCodeEnum.USER_NULL);
        }
        if(stringRedisTemplate.hasKey(LOCK_USER_REGISTER_KEY + userLoginReqDTO.getUsername())){
            throw new ClientException("用户已登录");
        }

        String uuid = UUID.randomUUID().toString();
        stringRedisTemplate.opsForHash().put("login_"+userLoginReqDTO.getUsername(),uuid,JSON.toJSONString(userDO));
        stringRedisTemplate.expire("login_"+userLoginReqDTO.getUsername(),30L, TimeUnit.DAYS);
        return new UserLoginRespDTO(uuid);
    }

    @Override
    public Boolean checkLogin(String username,String token) {

        return stringRedisTemplate.opsForHash().get("login_" + username, token)!=null;
    }

    @Override
    public void logout(String username, String token) {
        if(checkLogin(username,token)){
            stringRedisTemplate.delete("login_"+username);
            return;
        }
        throw  new ClientException("用户Token不存在或用户未登录");

    }
}
